Four-pack of Floss Action replacement toothbrush heads with micro-pulse bristles that penetrate deep between teeth for a floss-like clean and maximum freshness Remove twice as much plaque as an ordinary manual toothbrush With dentist recommended oscillate and rotate technology for maximum cleaning Dentists recommend changing your brush head every 3 months to keep that dentist feeling of clean Brush heads are interchangable with all Oral-B handles (excluding Pulsonic/Sonicbnip